Surfactant-induced Changes in Physicochemical Characters of Bentonite Clay

Pandey, Priyal; De, Nirmal

doi:10.9734/irjpac/2017/39374

Cited by 5 publications

(6 citation statements)

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“…In an aqueous solution, alkylammonium ions or quaternary ammonium cations can be maintained by both the interlayer and outer surfaces of bentonite via an ion exchange process. These ions were not easily displaced by smaller cations such as H + and Na + [67]. The expansion of basal spacing of clay after intercalating with the surfactant at 1CEC was similar to previous studies summarized in Table 7.…”

Section: Chemical and Physicalsupporting

confidence: 89%

“…Then, the head group of the surfactant cation could hold close to the clay surface. Since the surfactants were equally loaded to 1CEC, the interlayer spacing of MTBs was 19–20 Å; thus, the intercalation of the surfactant between the silicate layers was complete as a bilayer [67, 76]. The FESEM images of NTB and MTBs presented the surface morphology at a magnification of 50,000 (Figures 7(d)–7(f)).…”

Section: Resultsmentioning

confidence: 99%

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The Improvement of Natural Thai Bentonite Modified with Cationic Surfactants on Hexavalent Chromium Adsorption from an Aqueous Solution

Srikacha

Sriuttha

Neeratanaphan

et al. 2022

Adsorption Science & Technology

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This work was performed to evaluate the adsorption properties of modified Thai bentonites (MTBs) on hexavalent chromium (Cr(VI)) by using a popularly capable surfactant (hexadecyltrimethylammonium bromide (HDTMA)) compared to an alternative surfactant (cetylpyridinium chloride (CPC)). The adsorption properties of the surfactant load, adsorbent weight, contact time, initial Cr(VI) concentration, and temperature of the MTBs were evaluated. The results revealed that a higher surfactant load significantly affected the Cr(VI) adsorption, and the equilibrium adsorption was achieved at 60 min. The adsorption capacity improved when the adsorbent weight, contact time, initial concentration, and temperature increased as the highest adsorption capacities of 1CPC and 1HDTMA were 45.55 and 46.03 mg g-1, respectively. The isotherm and kinetic adsorptions were described by the Freundlich model and pseudo-second-order model, respectively, while thermodynamics indicated endothermic adsorption. After adsorption, X-ray absorption near-edge structure and extended X-ray absorption fine structure data showed that Cr ions did not change the valency state between Cr(VI) and Cr(III). Additionally, the adsorption mechanism can be depicted as the ion exchange between the Cr(VI) ion and the surfactant molecule. Structural evaluations by XRD, FTIR, FESEM, EDS, and TEM found that both MTBs (1CPC and 1HDTMA) with the best adsorption performance for Cr(VI) had obvious changes at both the interlayer structure and the external surface. The interlayer spacing was expanded from 14.85 Å to 20.48 Å (1CPC) and 18.79 Å (1HDTMA), and the new functional groups (CH2 scissoring, C–H symmetric stretching, C–H asymmetric stretching, and N–CH3 scissoring) and elemental compositions (Br and Cl) were observed in both MTBs. They demonstrated that the complete intercalation of surfactant molecules on bentonite structures supported Cr(VI) adsorption. Overall, the data indicate that MTBs were perfectly adsorbed on Cr(VI), and CPC was demonstrated to be a cheap alternative agent due to its adsorption capacity compared to the popularly capable HDTMA.

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Section: Chemical and Physicalsupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

The Improvement of Natural Thai Bentonite Modified with Cationic Surfactants on Hexavalent Chromium Adsorption from an Aqueous Solution

Srikacha

Sriuttha

Neeratanaphan

et al. 2022

Adsorption Science & Technology

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“…Guégana and Le Forestierc [43] with the objective of performance evaluation of organoclays for the amoxicillin retention in a dynamic context were modified Na-montmorillonite (Na-Mt) using a set of short and moderate chain surfactant (TMA, BTA, BTMA and TOM), and a long chain organoclay (HDTMA).…”

Section: Figurementioning

confidence: 99%

“…Pandey and De [43] employed a cationic surfactant cetyl tri methyl ammonium bromide (CTAB), wich was prepared in order to explore the adsorption potential of natural bentonite for organic pollutant and anionic molecules.…”

Section: Figurementioning

confidence: 99%

Organoclay Nano-Adsorbent: Preparation, Characterization and Applications

Yahya¹,

Hamdi²,

Hamdi³

2022

Nanoclay - Recent Advances, New Perspectives and Applications

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Organoclay has a tremendous impact on both fundamental studies and practical applications in numerous fields. In this context, this chapter investigates the performance of Organoclay in wastewater treatment. In particular, the adsorption of various hazardous substances has been reviewed. This study aims to give an overview of the preparation methods of Organoclay. The second purpose was to discuss the removal efficiency and reliability of various pollutants by organoclay. The third goal discussed the isotherms and kinetics used for the data interpretation. This work revealed that the characteristics of Organoclay depend mainly on the type of clay used and the nature of the intercalated surfactant. Sorption efficiency was found to depend on the nature of Organoclay, type of pollutant, pH, contact time and the concentration of pollutant.

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“…Chitosan and bentonite mineral clay can be used to form a hybrid matrix of desirable qualities and high performance in terms of physical, chemical and mechanical properties [24]. The use of chitosanbentonite matrix has been reported as a viable adsorbent for the separation of pollutants like heavy metals, dyes compounds, organic compounds, to mention but a few, from aqueous solutions especially those modified with surfactants (such as cetyltrimethylammonium bromide, CTAB, with molecular formula [(C16H33)N(CH3)3]Br) to enhance interlayer spacing of the bentonite structural frame work and introduce NH4 + as functional group in the composite or hybrid adsorbent [25]. In addition, CTAB facilitates adequate interlayer opening for chitosan intercalation [26][27] coupled with the electrostatic attraction of NH3 + and the available negative sites bentonite structure [28].…”

Section: Introductionmentioning

confidence: 99%

Comparative Studies of RSM, RSM–GA and ANFILS for Modeling and Optimization of Naphthalene Adsorption on Chitosan–CTAB–Sodium Bentonite Clay Matrix

Olafadehan

Bello²

2022

J. Appl. Sci. Process Eng.

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The aim of this article was to compare the predictive abilities of the optimization techniques of response surface methodology (RSM), the hybrid of RSM–genetic algorithm (RSM–GA) and adaptive neuro-fuzzy interference logic system (ANFILS) for design responses of % removal of naphthalene and adsorption capacity of the synthesized composite nanoparticles of chitosan–cetyltrimethylammonium bromide (CTAB)–sodium bentonite clay. The process variables considered were surfactant concentration, , activation time, , activation temperature, , and chitosan dosage, . The ANFILS models showed better modeling abilities of the adsorption data on the synthesized composite adsorbent than those of ANN for reason of lower % mean absolute deviation, lower % error value, higher coefficient of determination, , amongst others and lower error functions’ values than those obtained using ANN for both responses. When applied RSM, the hybrid of RSM–genetic algorithm (RSM–GA) and ANFILS 3–D surface pot optimization technique to determine the optimal conditions for both responses, ANFILS was adjudged the best. The ANFILS predicted optimal conditions were = 116.00 mg/L, = 2.06 h, = 81.2oC and = 5.20 g. Excellent agreements were achieved between the predicted responses of 99.055% removal of naphthalene and 248.6375 mg/g adsorption capacity and their corresponding experimental values of 99.020% and 248.86 mg/g with % errors of -0.0353 and 0.0894 respectively. Hence, in this study, ANFILS has been successfully used to model and optimize the conditions for the treatment of industrial wastewater containing polycyclic aromatic compounds, especially naphthalene and is hereby recommended for such and similar studies.

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Surfactant-induced Changes in Physicochemical Characters of Bentonite Clay

Cited by 5 publications

References 0 publications

The Improvement of Natural Thai Bentonite Modified with Cationic Surfactants on Hexavalent Chromium Adsorption from an Aqueous Solution

The Improvement of Natural Thai Bentonite Modified with Cationic Surfactants on Hexavalent Chromium Adsorption from an Aqueous Solution

Organoclay Nano-Adsorbent: Preparation, Characterization and Applications

Comparative Studies of RSM, RSM–GA and ANFILS for Modeling and Optimization of Naphthalene Adsorption on Chitosan–CTAB–Sodium Bentonite Clay Matrix

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